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20 terms

Arthropods

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Phylum Arthropoda general info
one of the largest phyla in kingdom Animalia
More than 1 million species
All adult Arthropods have jointed feet
Some juvenile arthropods do not
Characteristics of Arthropoda
have exoskeletons made of chitin
have a hemocoel (abdominal cavity)
have a hemolymph (fills hemocoel-bloodlike)
have a dorsal tube (circulatory system)
have a ventral mouth terminal anus (GI tract)
are dioecious (have separate sexes)
reproduce via eggs
hemocoel
a blood cavity within the bodies of certain invertebrates in which blood bathes tissues directly; part of an open circulatory system
hemolymph
the fluid that circulates through the body of an animal that has an open circulatory system
it is blue-green because it uses copper instead of iron
Subphylums of Arthropoda
Trilobitomorpha (extinct)
Onychophora (living fossils; horseshoe crabs)
Tardigrada (water bears)
Pycnogonida (sea spiders)
Chelicerata (mites, ticks, spiders, scorpions, etc)
Mandibulata (crustaceans, millipedes, centipedes & insects)
importance of Chelicerata & Mandibulata
1) cause disease by themselves
2) produce venoms & toxins through bites
3) are intermediate hosts for other parasites
4) act as vectors for bacterial infection
Class Insecta anatomy
have 6 nerve cells
like primitive mammals but not as well developed
head has antennae & compound eyes
thorax has legs, and wings if present
abdomen has reproductive organs, breathe oxygen
malpighian tubes
saclike organs that extract wastes from the blood in arthropods; rudimentary kidneys
simple metamorphosis
three development stages (i.e. roach)
1) egg
2) nymph (smaller form of adult)
3) adult
complex metamorphosis
four development stages (i.e. flea)
1) egg
2) larva (wormlike)
3) pupae (resting stage, up to 2 years)
4) adult
juvenile growth inhibitor
type of flea control
orders of class insecta
Dictyoptera: cockroaches & grasshoppers
Coleoptera: beetles
Lepidoptera: moths & butterflies
Hemiptera: true bugs
Hymenoptera: wasps, ants & other stinging insects
Anoplura: sucking lice
Mallophaga: chewing lice
Siphonoptera: fleas "winged suckers"
Diptera: 2-winged flies
Acarines
ticks and mites
Subphylum Chelicerata
Class Acarina
only females suck blood
Acariasis
infestation with ticks & mites
"mange"
dioecious
separate sexes
reproduce via eggs
dorsal tube
rudimentary circulatory system of arthropods
Acarina anatomy
have 8 legs
some seed ticks (juvenile ticks) have 6 legs
have an idiosoma & capitulum
capitulum
articulated (moveable) "false head"; the mouth parts
idiosoma
abdomen of acarina
legs are attached
life stages of Acarina
No metamorphosis
4 stages:
1) egg
2) larva (6 legs)
3) nymph (8 legs)
4) adult (8 legs)